(unstack b6 b3)
(putdown b6)
(unstack b2 b5)
(stack b2 b3)
(pickup b5)
(stack b5 b6)
(unstack b2 b3)
(stack b2 b5)
(pickup b3)
(stack b3 b2)
(unstack b4 b7)
(putdown b4)
(unstack b7 b1)
(stack b7 b3)
(pickup b1)
(stack b1 b7)
(pickup b4)
(stack b4 b1)
; cost = 18 (unit cost)
